This article will help you improve image quality and increase sharpness, as well as teach you how to fix a distorted image (i.e. with black bars on the sides).

Although image compression is responsible for a slight decrease in image clarity, image quality is defined by your computer and TV resolution, computer and network performance, and display calibration. This article will focus on display calibration.

The default image settings on most TV’s and projectors today are adjusted for best appearance when watching satellite TV. These settings aren't always perfect and often get adjusted incorrectly, which may distort the image sharpness and colors when showing a computer screen on a TV or projector. So to get the best picture, go through the key facts and try some of the configurations mentioned below.

Key Facts

🎯 Image quality depends on screen calibration
🎯 Overscan causes the picture to be cropped on all edges
🎯 The image shown on the TV is the resolution of your computer screen scaled to your TV screen's resolution
🎯 The Aspect ratio of TVs is usually 16:9, some computers use 16:10 which will be fitted 

Display Calibration

Let's start with opening an Excel-style spreadsheet. You can refer to its different gray scales in the rows, columns and the menu bar as guidelines for the adjusting the screen settings. You will see if the picture has poor quality and wrong colors.

Then follow these steps:

  1. Find the best looking standard mode (Can be named Natural) or reset all adjustments
  2. Reduce contrast until all the lines in the spreadsheet are visible (Often around 70-80% of max value)
  3. Reduce sharpen until the text looks good and is easy to read (Often 0-20% of maximum)

️ A setting called “Black levels” in advanced settings can be useful for getting the light gray tones to look good.

🔧 Disabling 100 Hz and other image processing settings will remove latency caused by the TV. This will make it feel more responsive. The downside will be that, when playing video, it can look less fluent because the TV doesn't process extra frames.
 

Disable Overscan

Many TVs and Projectors still use a setting called "Overscan" for standardizing a picture size sent from satellite TV, and this may be enabled by default.

Symptom: The picture looks cropped, where the edges seem to continue past the screen's boundaries.

How to Fix:

  1. Start a stream
  2. Open your TV's screen settings
  3. Look for "Screen Size" or "screen Adjustments" or "Aspect Ratio" or "Overscan"
  4. Cycle through the various options until the image fits the screen correctly. Usually, the correct option is "Native", "Full" or "Unscaled".

️ If the TV has a PC mode this often both disables Overscan and adjust the image settings for the optimal quality when receiving a digital signal from a PC. On top of that, it also disables many image processing that will lower the latency when streaming.
 

Resolution

The image resolution shown on the TV is the resolution of your computer screen scaled to the resolution of your TV screen. This means that if your computer has a 720p monitor, the picture streamed to your TV will also be 720p even though the TV is 1080p.
Airtame 1 is using HDMI hotplug events in order to record the new resolution provided by screen every time it gets plugged into HDMI port of the screen or projector, even while still being powered.
Airtame 2 device does not use hotplug events and will show resolution that was pre-selected or which was used during first boot. To force new resolution you will have to reboot device or select resolution manually.

Filling the whole screen

Modern TV screens use a 16:9 aspect ratio, however, most modern computers use a 16:10 aspect ratio. When Airtame (16:9) shows a 16:10 ratio, it must scale the image to fit the screen without distorting it. The result is black bars on either side of the image.

🎯 If you would like to stream your picture without seeing black bars you'll need to change the resolution of your computer screen to one of these 16:9 resolutions:

  • 1920 x 1080
  • 1280 x 720

⏭ Verify the whole setup by clicking here


▶️ If you would like to download a PDF of following deployment guide, click here for Airtame 1 and here for Airtame 2

👉 Learn more

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